SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5401d93d28c1a1241378f719ec5efa7f2d68752fee3ff043d46578938a112012' 
  AND token = 'ju4MHqRPD75a+kzHIj/eVRy0KCXptBfGP4QLPwRhWlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}